Detroit — At their 21st annual kickoff luncheon, attended by owner Martha Firestone Ford, the Lions, now 60 years from their last NFL championships, were described by their head coach as a good team that can be great and by the quarterback as a squad perhaps poised for an elevated performance.

Jim Caldwell and Matthew Stafford described accomplishing the task as essentially a matter of will.

They were applauded by members and invitees of the Detroit Economic Club, in the cavernous atrium of Ford Field, where a concert was setting up for the rock band, U2.

“With our Without You,” the Lions “Sunday Bloody Sunday” might just be a “Beautiful Day.”

And if they can manage a couple of wins in postseason — tripling their total since their NFL title in 1957 — they would have a lot more “Pride” and maybe even a “Song for Someone.”

But enough riffing on U2 song titles.

What about the 2017 Lions?

Their head coach issued a call for disciplined determination.

“This is an exceptional group, from top to bottom,” said Caldwell, who enters his fourth season as the Lions’ head coach, with a 27-21 (.563) record in the regular season and 0-2 in the playoffs.

“I think the guys that have been added through the draft, added to our team through free agency, when you put all that together with the great nucleus we had here, it’s a pretty special group.

“They work extremely hard. They do a great job in terms of setting the tone for the younger guys.”